M-theory

Macadamia nut

Mach number

Machinability of metals

Machine

Machine design

Machine element

Machine key

Machine learning

Machinery

Machining

Mackerel

Macrocyclic compound

Macrocyclic peptides used as drugs

Macrodasyida

Macroevolution

Macromolecular engineering

Macrophage

Macroscelidea

Macrostomorpha

Madagascan primates

Madelung constant

Magellanic Clouds

Magma

Magnesite

Magnesium

Magnesium alloy

Magnesium diboride superconductors

Magnet

Magnet wire

Magnetic compass

Magnetic confinement fusion

Magnetic ferroelectrics

Magnetic instruments

Magnetic lens

Magnetic levitation

Magnetic materials

Magnetic monopole

Magnetic observatory

Magnetic random access memories

Magnetic reception (biology)

Magnetic recording

Magnetic relaxation

Magnetic resonance

Magnetic reversal

Magnetic separation methods

Magnetic susceptibility

Magnetic thermometer

Magnetic thin film

Magnetic thin film research

Magnetism

Magnetite

Magnetization

Magneto

Magnetocaloric effect

Magnetochemistry

Magnetohydrodynamic power generator

Magnetohydrodynamics

Magnetometer

Magneton

Magnetooptics

Magnetoresistance

Magnetorheological finishing (optics)

Magnetosphere

Magnetostriction

Magnetron

Magnification

Magnitude (astronomy)

Magnolia

Magnoliales

Magnoliidae

Magnoliophyta

Magnoliopsida

Magnon

Mahogany

Maillard reaction

Main-group multiple bonds

Maintenance, industrial and production

Malachite

Malacostraca

Malaria

Malnutrition

Malpighiales

Malvales

Mammalia

Mammary gland

Mammography

Mammoth

Mandarin

Manganese

Manganese nodules

Mango

Mangrove

Manifold (mathematics)

Manipulating cold atoms

Manipulation of heat flow

Mantle transition-zone water filter

Mantodea

Mantophasmatodea

Manufactured fiber